That is a really cute sweater and looks great on your grandson. I had to really laugh though because from the title of the post I was expecting a dog sweater (you know, for a dog) and then you said your 5 year old grandson was modeling it for you, and there was no picture, but I was having a hard time picturing your DGS wearing a dog sweater. ROTFLOL I don't know why my mind glitched but it did; after all I titled one of my sweaters "Ducky Sweater" and it was not for a duck. LOL
Nice intarsia work. Color choices are really nice too. Lots of contrast to show off the doggy. Some child will really love this sweater.